在脸书上张贴大图

Posted 2023-03-07

【中文标题】在脸书上张贴大图

【英文标题】：Posting larger image on facebook

【发布时间】：2011-09-27 10:02:28

【问题描述】：

如何通过 iphone 以编程方式在 facebook 墙上发布大图像。我正在使用 FBConnect API 我如何实现这一点。

谢谢

【问题讨论】：

即使您发送原始图像，facebook也会自动将其调整为720x720（或其他）。因此 facebook 建议在发送前将图像大小调整为最大 720px，以节省发送时的用户流量/时间。

【参考方案1】：

Facebook docs 说：

强烈建议您先在应用程序中缩放图像，然后再将其添加到请求中。最大尺寸应不超过 720 像素（Facebook 支持的最大显示尺寸）。

【参考方案2】：

用 Graph API 试试这个

 - (IBAction)uploadPhoto:(id)sender 

NSString *path = @"http://www.facebook.com/images/devsite
                     /iphone_connect_btn.jpg";
 NSURL *url = [NSURL URLWithString:path];
 NSData *data = [NSData dataWithContentsOfURL:url];
 UIImage *img  = [[UIImage alloc] initWithData:data];

 NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                             img, @"picture",
                             nil];

 [_facebook requestWithGraphpath:@"me/photos"
                    andParams:params
                    andHttpMethod:@"POST"
                    andDelegate:self];

[img release];

【参考方案3】：

-(void)postMessageWithPictureOnFB


    NSString *urlString = [[NSString alloc] initWithFormat:@"https://graph.facebook.com/me/photos"];
    NSURL *url = [[NSURL alloc] initWithString:urlString];

    NSData *picture_data =  UIImagePNGRepresentation([UIImage imageNamed:@"apple.png"]);
    NSMutableData *body = [[NSMutableData alloc] initWithCapacity:1];
    NSString *boundary = [[NSString alloc] initWithString:@"----1010101010"];
    NSString *contentType = [[NSString alloc] initWithFormat:@"multipart/form-data; boundary=%@",boundary];

    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Disposition: form-data; name=\"message\"\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[textView.text dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"media\";\r\nfilename=\"media.png\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:picture_data];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Disposition: form-data; name=\"access_token\"\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[facebook.accessToken dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    serverRequest = [ASIHTTPRequest requestWithURL:url];
    [serverRequest addRequestHeader:@"Content-Type" value:contentType];
    [serverRequest appendPostData:body];
    [serverRequest addRequestHeader:@"Content-Length" value:[NSString stringWithFormat:@"%d", body.length]];
    //[serverRequest setDelegate:self];
    //[serverRequest setDidFinishSelector:@selector(postMessageWithPictureOnFBRequestDone:)];
    //[serverRequest setDidFailSelector:@selector(postMessageWithPictureOnFBRequestWentWrong:)];
    [serverRequest startAsynchronous];

    [urlString release];
    [url release];
    [body release];
    [boundary release];
    [contentType release];